Boiler



Dec. 8, 1931. I w, E R 1,835,500

BOILER FiledDec- 5, 1929 2 Sheets-Sheet 1 'Dec. 8, 1931.

W. A. J. KREAGER BOILER Filed Dec 5, 1929 2 Sheets-Sheet f2 zik mw Patented Dec. 8, 1931 UNITED STATES PATENT OFFICE WILLIAM A. J. IKREAGER, OF DENVER, COLORADO. ASSIGNOR, ZBY MESNE ASSIGN- MI1'N'TS, TO BARQUE ROYALTY, INQ, 01? DENVER OOLOBAIDOfA. GORPORA TION' OF COLORADO BOILER Application filed December 5, 1929. Serial No. 411,936.

This invention relates to improvements in boilers of the type employed for heating and for the generation of steam for power.

It is the object of this invention to produce a boiler of such construction that it will have a very large thermal efliciency and a larger capacity per unit of heating surface than is ordinarily obtained by standard boiler construction.

Another object of this invention is to produce a boiler of such construction that it can readily be taken apart so as to facilitate cleaning and repair.

Another object of. this invention isto produce a boiler in'which all of the parts that are heated by the combustion of the fuel will be enclosed in water so that there will be no escape of heat from the heated portions thereof. y

7 Another object of this invention is to produce a boiler that is especially well adapted for use with either gas or oil and which does not require an expensive boiler setting but which can be readily put in place and connected to the heating system or with the steam engines that are to be operated thereby.

The above and other objects which may become apparent as this description proceeds are attained by means of a construction and an arrangement of parts that will now be described in detail, reference for this purpose being had to the accompanying drawings in which the preferred embodiment of the invention'has' been illustrated, and in which:

Fig. 1 is an end view of the improved boiler, portions being broken away to better dis close the construction; v

Fig. 2 is a section taken on line 2-2,

Fig. 5; v

ig. 3 is a section of a portion of the boiler, this section being similar to that shown in Fig. 5, but. drawn to a somewhat enlarged scale;

Fig. 4 is a. 5; and Fig. Fi 1. I

the drawings reference numeral 1 represents the cylindrical boiler shell. One end 5 is' a section taken on line 5-5,

of this shell is closed by an end member 2 section taken on line 4-4, Fig.

which is provided with an inwardly extending cylindrical flange 3 that may be secured in place by rivets 4 in the manner shown inattached to each other, they may be electrow welded or welded by any other means, and therefore the particular means of securing the parts together is notintended as limiting the invention to this particular means. The end of member 1 to which the ring 5 is secured is closed by means ofan end closure 8, which is formed into the shape shown in Fig. 1 by means of special forming dies and is provided at its center with an outwardly extending flange 9 and at its edges with a cylindrical flange 10. Secured to the flange 10 is a, ring 11 that is also provided with'a flange 12 which fits against the flange 6 and which is secured drical member 14 is secured to the inner surface of. the opening formed by flange 9 and the inner end of this member is provided with a flange 15 that is welded to the outer surface thereof. Member '8 is also. provided with an openin surrounded by a flange 16. A cylindrical ue 17 is secured in the opening and fastened to flange 16 as shown in Fig. 5. The inner end of cylindrical member 17 is also provided with a flange 18 that is welded to the outer surface thereof in the same manner as flange 15 is secured to member 14. This construction is shown most clearly in Fig. 3 to which reference may be had. When the boiler is used for steam generation, a steam drum 19 is located over the boiler and connected with the interior thereof by two tubular members 20. These tubular members are formed from two parts of similar construction and which are each provided with a flange 21. These flanges are connected to each other by means of bolts 22. The steam in passing from thedrum to the steam pipe 23 flows through an opening formed by another member 20 in the manner shown in Fig. 5. The drum 19 is of ordinary construction and is provided with end members 24 and 25 secured in place by rivets or by being welded to the shel The boiler instead of being supportedby abrick work boiler setting is supported by means of a framework consisting of a plurality of vertical channels 26 that are connected to the boiler and to each other in such a way as to support the boiler in a substantial manner.

Secured to the inner surface of shell 1 are two parallel tracks 27 which serve as supports for the furnace chamber and the flue assembly which will now be described.

The furnace or combustion chamber is formed by a cylindrical tubular member 14a of the same diameter as member 14. To the inner end of the combustion chamber a plate 28 is connected. A ring 29 of angle iron is secured to the plate 28 in the manner shown in Fig. 5, preferably by means of bolts 30. A dished end closure 31 is secured to the cylindrical flange of member 29. Plate28 is provided with openings for the flues to which reference will presently be made. A baflie plate 32 extends across the chamber that is formed by plate 28 and theend closure 31 and divides this chamber into two compartments A and B. Secured to the other end of member 14a. is a steel or cast iron ring 33. This is preferably welded to the member 14a. An annular plate 34 has its inner edge secured to member 33 by means of bolts or rivets 3."). This plate is provided with openings for the reception of flues. The location of these corresponds to those that'arc provided in plate 28. The flues located above the baffle plate 32 have been designated by reference numera1 36 and form a group through which the heated gases pass after leaving the combustion chamber. A channel shaped ring 37 is secured to the outer edge of plate 34 and secured to the other flange of this channelshaped ring is an annular plate 38. Plate 38 has an opening at its center whose diameter is equal to the inside diameter of the combustion chamber. The inner edge of plate 38 is clamped in place between the flanges of members 15-and 33. Since the interior of the chambers C, which is formed by plates 34 and 38 and by the rings 33 and 37, is subjected to a pressure only slightly above atmospheric, it is obvious that the pressure of the steam has a tendency to collapse the walls of this chamber and for the purpose of preventing this. spacers 39 have been provided. A baflie plate 40 extends transversely of ch am-. ber C below the flues 41 and theiet'ore the heated gases from the combustion chamber will first pass into chamber A. thence through the group of tubes 36 into chamber C and from chamber G through tubes 41 to chamber B. Another group of tubes which have been designated by reference numeral 42 connect the lower portion of chamber B with that portion of chamber C that is located below battle plate 40, and therefore the gases from chamber B will pass through tubes 42 into the lower portion of chamber C and from thence into the exhaust flue 17. The feed water is admitted through one or more of openings 43 and passes upwardly and therefore the feed water first comes into contact with the flues 42 in which the temperature of the gases of combustion is the lowest, and therefore as the feed water rises, it progressively comes into contact with heating surfaces that are heated to a higher temperature and finally the water at the top of the boiler is in contact with the flues 36 which have the highest temperature. In actual practice the water in the boiler is maintained at a level below the uppermost of the flues in group 36 and therefore these serve as superheaters for the steam.

When the boiler is employed for heating water only, as when it is used in connection with the hot water heating system, the steam drum 19 can be omitted, as is quite apparent. The end of member 14 is partially closed by means of a plate 44 which is provided.

with an opening 45 through which the burner extends. The burner has not been shown as different forms of burners can be used.

In operating the boiler either gas or liquid fuel is employed and this is preferably introduced under pressure and mixed with the proper amount of air, and when the proper type of burner is employed, the flame will fill the entire length of the combustion. chamber and the gases of combustion will pass outwardly in the manner already described. Since the feed water enters the boiler at the bottom and since the gases also leave near the bottom, practically all the heat is removed from the gases before they enter the exhaust flue 17 and therefore very high thermal eificiency is obtained. The entire outer surface of the boiler can be covered witha heat insulating material and the steam drum 19 can also be so covered if desired.

The assembly comprising the combustion chamber 14a and the flues is supported on tracks 27 by means of rollers 46 and if it is desired to repair the flues or to clean the same the end closure 8 is removed by first removing bolts 13. When bolts 13 have been removed the assembly is pulled for wardly so as to enable the workmen to remove the bolts that pass through the flanges 15 and 18 after which the end closure 8 and the cylindrical tubes 14 and 17 can be entirely detached, after which plate 38 can be removed so as to give access to the flues. If necessary the assembly comprising a combustion chamber and flues can be entirely removed from the boiler and the end closure 31 can also be removed-so as to give access to the flues at both ends and therefore any necessary repairs can readily be made and the cleaning of all parts can be conveniently effected because the workmen have access to every portion of the boiler which is of great assistance in keeping the same in proper repair.

Having described the invention what is claimed as new is:

1. A boiler having a readily removable combustion chamber and flue assembly, comprising, in combination, a cylindrical shell portion having means for closing both ends, one of the ends being removable, a hollow cylindrical member secured to and extending through the removable end and into the cylindrical shell, said. member forming a combustion chamber, a plate secured to the inner end. of the last mentioned member, a concave end member secured at its edges to the plate and forming therewith a flue chamber, a plate (32)"extending across the flue chamber below the combustion chamber and dividing it into two compartments, 2; manifold surrounding the other end of the combustion chamber, a plate (40) extending across the interior of the manifold at a point below the combustion chamber and dividing the manifold into an "upper and a lower com partment, a group of flues extending from the upper compartment of the flue chamber to the upper compartment of the manifold, another group of flues connecting the lower portion of the upper compartment of the manifold with the upper portion of the lower compartment of the flue chamber and a third set offlues connecting the lower compartment of the flue chamber with the lower compartment of the manifold. v

2. A boiler comprising, in combination, a cylindrical shell having one end closed, the other end being open and surrounded by an outwardly extending flange, a removable end closure secured to the flange by means of bolts, the removable end closure having two tubular members secured thereto and extending therethrough both of said tubular members being eccentrically located with respect to the end closure, one of the tubular members being located above the center and the other eccentrically located below the center of the cylindrical shell, the tubular. member above the center forming an extension of a combustion chamber, an annular manifold secured to. the inner ends'of the tubular members, the manifold havin an opening exten ing therethrough. and in alignment with the opening in the upper tubular member, an

elongated tubular member having one end.

secured in the upper opening of the manifold and having the other end located adjacent the closed end of the shell, said elongated member forming a combustion chamber, a hollow member secured to the inner end of the elongated tubular member, said hollow member forming a flue chamber, a plate extending across the flue chamber at a point below the combustion chamber and dividing the flue chamber into an upper and. a lower compartment, a plate extending across the manifold. below the combustion chamber and dividing it into an upper and a lower compartment, flues extending between the upper compartment of the flue chamber and the upper com artment of the manifold chamber, a set of ues connecting the upper compartment of the manifold chamber with the-lower compartment of the flue chamber and another set of flues connecting the lower compartment of the flue chamber with the lower compartment of the manifold chamber.

3. A unitary heater assembly for use with a cylindrical boiler shell, said assembly comprising an elongated tubular member whose interior is adapted to form a combustion chamber, an annular plate eccentrically secured to one end of the elongated member, a concave plate secured at its edge to the edge of the annular plate whereby a flue chamber is formed, an annular manifold eccentrically secured to the other end of the elongated tubular member, the eccentricity of the flue chamber and of the manifold being alike and the part of both having the greatest eccentricity being located below the center of the elongated tubular member, a plate extending across the flue chamber below the combustion chamber and dividing the flue chamber into an upper and a lower compartment, a plate extending across the manifold chamber beneaththe combustion chamber and dividing the latter into an upper and a lower compartment, a'set of flues connecting the upper compartment of the flue chamber with the upper compartment of the manifold, another group of flues connecting the lower portion of the upper compartment of the manifold with the lower compartment of the flue chamber and a third set of flues connecting the lower compartment of the flue chamber with the lower compartment of the manifold.

4. A boiler comprising, in combination, a cylindrical shell having oner-e nd closed and the other open, a unitary conibustion cham: her and flue assembly comprising an elongated tubular member whose interior forms a combustion chamber, a hollow circularmember of greater diameter than the tubular member eccentrically secured to the inner end thereof with the portion of greatest e'ccentricity at the bottom, an annular manifold eccentrically secured to the other end of the elongated tubular member with the portion of reatest eccentricity towards the bottom, the ue jehamber and the manifold being each divided into an upper and a lower compartment by means of plates located below the combustion chamber, a set of flues connecting the upper compartment of the flue chamber with the upper compartment of the manifold, another set of flues connecting the upper compartment of the manifold with .the lower compartment of the flue chamber, a third set of flues connecting the lower compartment of the flue chamber with the lower compartment of the manifold, and a closure for the open end of the shell, said closure having a tubular I member extending therethrough and forming an extension of the combustion chamber and a second tubular member adapted to be connected with the interior of the lower compartnient of the manifold to form a flue for the escape of flue gases. In testimony whereof I aflix my signature.

WILLIAM A. J. KREAGER. 

